The median/average age of the population of Hidden Valley is 40 years of age.

86.5% of people living in the suburb of Hidden Valley were born in Australia. The other top responses for country of birth were 3.4% New Zealand, 2.6% England, 1.0% South Africa, 0.7% Canada, 0.7% United States of America, 0.7% Philippines.

96.2% of people living in Hidden Valley speak English only. The other top languages spoken are 2.8% Language spoken at home not stated, 0.5% Filipino , 0.5% Cantonese.

60.7% of people are married, 26.5% have never married and 7.2% are divorced and 2.1% are separated. There are 16 widowed people living in Hidden Valley.

60.5% of the people living in Hidden Valley over the age of 15 and who identify as being in the labour force are employed full time, 32.9% are working on a part time basis. Hidden Valley has an unemployment rate of 3.0%.